7878465 has 60 divisors (see below), whose sum is σ = 16470036. Its totient is φ = 3592512.

The previous prime is 7878461. The next prime is 7878487. The reversal of 7878465 is 5648787.

7878465 is a nontrivial binomial coefficient, being equal to C(3970, 2).

It can be written as a sum of positive squares in 2 ways, for example, as 4064256 + 3814209 = 2016^2 + 1953^2 .

It is not a de Polignac number, because 7878465 - 2² = 7878461 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 7878465.

It is not an unprimeable number, because it can be changed into a prime (7878461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 19647 + ... + 20043.

Almost surely, 2^7878465 is an apocalyptic number.

7878465 is the 3969-th triangular number and also the 1985-th hexagonal number.

It is an amenable number.

7878465 is an abundant number, since it is smaller than the sum of its proper divisors (8591571).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7878465 is a wasteful number, since it uses less digits than its factorization.

7878465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428 (or 412 counting only the distinct ones).

The product of its digits is 376320, while the sum is 45.

The square root of 7878465 is about 2806.8603456531. The cubic root of 7878465 is about 198.9820358690.

The spelling of 7878465 in words is "seven million, eight hundred seventy-eight thousand, four hundred sixty-five".